Arctic may be ice-free in future: study

Analysis of Arctic climate from 2.2 to 3.6 million years ago suggests that with estimated atmospheric carbon dioxide  similar to today's levels, the Arctic was very warm, with no ice sheets. The analyses of the longest continental sediment core ever collected in the Arctic, completed by a team led by Julie Brigham-Grette of the University of Massachusetts Amherst, provide ‘absolutely new knowledge’ of Arctic climate. ‘While existing geologic records from the Arctic contain hints about this time period, what we are presenting is the most continuous archive of climate change information.’